ASoC: omap: mcbsp: Use uniform st_data pointer initialization

In this way we can save few lines, and have uniform way of initializing the
st_data in all functions.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Liam Girdwood <lrg@ti.com>

sound/soc/omap/mcbsp.c

@@ -273,11 +273,9 @@ static void omap_st_chgain(struct omap_mcbsp *mcbsp)
 
 int omap_st_set_chgain(struct omap_mcbsp *mcbsp, int channel, s16 chgain)
 {
-	struct omap_mcbsp_st_data *st_data;
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 	int ret = 0;
 
-	st_data = mcbsp->st_data;
-
 	if (!st_data)
 		return -ENOENT;
 
@@ -298,11 +296,9 @@ int omap_st_set_chgain(struct omap_mcbsp *mcbsp, int channel, s16 chgain)
 
 int omap_st_get_chgain(struct omap_mcbsp *mcbsp, int channel, s16 *chgain)
 {
-	struct omap_mcbsp_st_data *st_data;
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 	int ret = 0;
 
-	st_data = mcbsp->st_data;
-
 	if (!st_data)
 		return -ENOENT;
 
@@ -337,9 +333,7 @@ static int omap_st_start(struct omap_mcbsp *mcbsp)
 
 int omap_st_enable(struct omap_mcbsp *mcbsp)
 {
-	struct omap_mcbsp_st_data *st_data;
-
-	st_data = mcbsp->st_data;
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 
 	if (!st_data)
 		return -ENODEV;
@@ -368,11 +362,9 @@ static int omap_st_stop(struct omap_mcbsp *mcbsp)
 
 int omap_st_disable(struct omap_mcbsp *mcbsp)
 {
-	struct omap_mcbsp_st_data *st_data;
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 	int ret = 0;
 
-	st_data = mcbsp->st_data;
-
 	if (!st_data)
 		return -ENODEV;
 
@@ -386,14 +378,11 @@ int omap_st_disable(struct omap_mcbsp *mcbsp)
 
 int omap_st_is_enabled(struct omap_mcbsp *mcbsp)
 {
-	struct omap_mcbsp_st_data *st_data;
-
-	st_data = mcbsp->st_data;
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 
 	if (!st_data)
 		return -ENODEV;
 
-
 	return st_data->enabled;
 }